Accretion in low-mass members of the Orion Nebula Cluster with young transition disks

R.M.G. de Albuquerque (1) , J.F. Gameiro (2) , S.H.P. Alencar , J.J.G. Lima (2) , C. Sauty (1, 3) , C. Melo (4)

1 LUTH (UMR_8102) - Laboratoire Univers et Théories
2 Universidade do Porto = University of Porto
3 LUPM - Laboratoire Univers et Particules de Montpellier
4 ESO - European Southern Observatory [Santiago]

Context. Although the Orion Nebula Cluster is one of the most studied clusters in the solar neighborhood, the evolution of the very low-mass members (M* < 0.25 M⊙) has not been fully addressed due to their faintness.Aims. Our goal is to verify if some young and very low-mass objects in the Orion Nebula Cluster show evidence of ongoing accretion using broadband VLT/X-shooter spectra.Methods. For each target, we determined the corresponding stellar parameters, veiling, observed Balmer jump, and accretion rates. Additionally, we searched for the existence of circumstellar disks through available on-line photometry.Results. We detected accretion activity in three young stellar objects in the Orion Nebula Cluster, two of them being in the very low-mass range. We also detected the presence of young transition disks with ages between 1 and 3.5 Myr.Key words: stars: low-mass / stars: pre-main sequence / open clusters and associations: individual: Orion Nebula Cluster

Mots clés: stars: low-mass; stars: pre-main sequence; open clusters and associations: individual: Orion Nebula Cluster

Domaines: Physique [physics]

R.M.G. de Albuquerque, J.F. Gameiro, S.H.P. Alencar, J.J.G. Lima, C. Sauty, et al.. Accretion in low-mass members of the Orion Nebula Cluster with young transition disks. Astronomy and Astrophysics - A&A, 2020, 636, pp.A86. ⟨10.1051/0004-6361/201936694⟩. ⟨hal-02613203⟩